Hoisting device



Patented Nov. 7, 1922.

lad h i'id tdhiiTED STATES PATENT tli i itliil.

THEODORE CARLSON, OF STILLWATER, WASHINGTON.

HOIS'IING DEVICE.

Application 'filcd July 5,

To aZZ 2071 0072, it may concern,

Be it known that I, Tnnononn CARL-SON, a citizen. of the United States,residing at Stillwater, in the county of King and State of lvashington,have invented certain new and useful Improvements in Hoisting Devices,of which the following is a specification.

This invention relates to hoisting devices and, more especially, to animprovement in the apparatus shown and described in United States PatentNo. 1,369,963 issued to me March 1, 1921.; and the object of thisinvention is to simplify and. lessen the cost oi construction andgenerally to render the device more convenient and efficient inoperation.

In the accompanying drawings,-

Figure 1 is a front elevation, with a portion broken away, of devicesembodying the present invention shown applied. Fig. 2 is a frontelevation of the devices with the parts thereof in different relativepositions than in which they are shown in Fig. 1. Fig. 3 is a sideelevation of the device.

The improved hoisting devices consist oi a grapple consisting of twolever members 5 which are respectively .t'ulcrumed at about themidlengths thereof by pins 6 to the lower ends of links 7. As shown,these links are each comprised of a pair of bars spaced apart toaccommodate therebetween one of said lever members and guide pulleys 8and 9. The pulleys 8, one for each pair of link bars, are rotatable uponpins 10 secured to the associated links at about the midlengths of thelatter. The other pulley 9 is rotatable upon a pin 11 which serves tohingedly connect the upper ends of the links together.

The hook-arms 12 of the grappling levers 5 below the fulcrum pointsthereof constitute jaws and terminate in opposed bills 13. The otherlever arms 14- are pivotally connected together by means of a pin 15which serves to couple a clevis 16 to the levers. Said clevis is engaged.in the bight 17 of an endless rope 18, or an equivalent, which passesupwardly through ways or openlngs between the complementary link bars atdiametrically opposite sides of the pulley 9 and is suspended by a mainhoisting cable 19.

Each of the grapple jaws is connected at 20 to an end of a flexiblesling 21 which extends through the openings or ways in the 1921. SerialNo. 482,353.

adjacent link above and below the guide pulleys 8, as shown, and issuspended by a supplementary, or releasing cable 22.

The sling 21 constitutes, in effect, bifurcations or branches of thecable 22 and may, if desired, be made a part thereof.

The cables 19 and 22 respectively pass over sheaves 23 and 24: andthence extend as leads 19 and 22 to suitable cable winding drums, notshown.

i Vith the main cable 19 slack and utilizing the supplementary cable 22the jaws of the device are brought, as shown in Fig. 2, into theirrelatively open positions to receive a load.

By then rendering the main cable 19 operative, the grapple arms arecaused to engage the load (Fig. 1) which may thereupon be elevatedthrough the medium of the hoisting cable acting alone or by both cablesacting cooperatively according to the desire of the operator or theweight of a load.

What I claim, is,-

1. In apparatus of the character described, a grappling deviceconsisting of two links pivotally connected together at the upper endsthereof, a pair of levers fulcrumed intermediate their lengths to thelower ends of said links and affording hook shaped arms depending fromthe respective links and arms located between said links, a hoistingcable, means operatively connecting said cable to the last named armsand extending through ways provided in said links, a releasing cable,and link guided connections between the releasing cable and said arms.

2. In apparatus of the character described, a pair of links eachcomprising two spaced bars, a pin pivotally connecting the upper ends ofthe bars of both links together, a guide rope-pulley rotatable in thespace between the complementary bars of each link and at about themidlength thereof, a pair of grappling levers extending through thespaces between the bars of the respective links and fulcrumed thereto atsubstantially the lower ends of the links, each of said levers having anarm depending from the adjacent link and a second arm located betweenthe links, a pin pivotally connecting the second named arms of bothlevers together, a hoisting cable, a connection between the hoistingcable and the second named arms, said connection being guided in saidlinks, a releasing cable having connections secured to the first namedarms of said levers and guided by said pulleys and the respective links.

3. In hoisting apparatus, a grappling de vice consisting of two linkspivotally connected at one end of each, and a tongs member fulcrunied atabout its inidle-ngth to the free end of each of said links andpivotally connected With each other between the links, a hoisting cable,a releasing cable, and flexible connections extending through Waysprovided in the links and connecting the respective cables with saidtongs members at opposite sides of the fulcrums thereof whereby thetongs members are caused to be swung into and from their operativepositions respectively by employing the hoisting cable and the releasingcable.

Signed at Seattle, Washington, this Qth day of June, 1921.

THEODORE CARLSON. \Vitnesses:

PIERRE BARNES, MARGARET Gr. SUPPLE.

